Cevapcici sounds REALLY good. I wonder where in Houston I could find some.
Well if you can cook, here is a recipe that sounds pretty good: http://www.cdkitchen.com/recipes/recs/44/Cevapcici_Yugoslavian_Sausages49608.shtml
The Muslims omit the pork from the recipe and the actual percentages of meats are to taste, so don't be afraid to experiment a little to get it how you like it.
The good news is that these are just rolled sausages without the skin, so they aren't all that difficult to make.
They're just pork & beef rolled into sausage-like pieces (usually thumb-sized). Depending on your personal preference, you usually add some onions, garlic, paprika, minced hot peppers (jalapenos will do), pepper, salt, an egg (or eggs, depending on the quantity of meat) and some (sunflower) oil into the pork & beef mix.
You can then shape the meat any way you like (chevaps, burgers, etc) and BBQ it. Hank Hill will kill me, but I prefer charcoal. :)
As for availability, if you can't find a Serbian (or any ex-Yugoslav) restaurant, try making some yourself. Just gave you the recipe :) Regards.